class CheckDefinitionValidityPass

CheckDefinitionValidityPassTest.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Tests/Compiler/CheckDefinitionValidityPassTest.php

class CheckDefinitionValidityPass implements CompilerPassInterface {

  /**
   * Processes the ContainerBuilder to validate the Definition.
   *
   * @param ContainerBuilder $container
   *
   * @throws RuntimeException When the Definition is invalid
   */
  public function process(ContainerBuilder $container) {
    foreach ($container
      ->getDefinitions() as $id => $definition) {

      // synthetic service is public
      if ($definition
        ->isSynthetic() && !$definition
        ->isPublic()) {
        throw new RuntimeException(sprintf('A synthetic service ("%s") must be public.', $id));
      }

      // synthetic service has non-prototype scope
      if ($definition
        ->isSynthetic() && ContainerInterface::SCOPE_PROTOTYPE === $definition
        ->getScope()) {
        throw new RuntimeException(sprintf('A synthetic service ("%s") cannot be of scope "prototype".', $id));
      }

      // non-synthetic, non-abstract service has class
      if (!$definition
        ->isAbstract() && !$definition
        ->isSynthetic() && !$definition
        ->getClass()) {
        if ($definition
          ->getFactoryClass() || $definition
          ->getFactoryService()) {
          throw new RuntimeException(sprintf('Please add the class to service "%s" even if it is constructed by a factory ' . 'since we might need to add method calls based on compile-time checks.', $id));
        }
        throw new RuntimeException(sprintf('The definition for "%s" has no class. If you intend to inject ' . 'this service dynamically at runtime, please mark it as synthetic=true. ' . 'If this is an abstract definition solely used by child definitions, ' . 'please add abstract=true, otherwise specify a class to get rid of this error.', $id));
      }
    }
  }

}